This is the fourth edition of Tango with Django which has now been heavily revised and upgraded to make use of Django 2.x using Python 3.x. The book was first launched in October 2013 by Dr. Leif Azzopardi and Dr. David Maxwell while both were teaching web development at the University of Glasgow. The book has been used as the course text ever since, with literally thousands of undergraduate and postgraduate students using it over the years